Jimmy Page is hard at work at remastering the Led Zeppelin catalogue and finding a string of releasable outtakes and alternate versions of the band's classics. Page, who also served as Zeppelin's producer, spoke about the technical aspects of overhauling the band's recorded output, telling Rolling Stone, "The catalog was last remastered 20 years ago. That's a long time. Everything is being transferred from analog to a higher-resolution digital format. That's one of the problems with the Zeppelin stuff. It sounds ridiculous on MP3. You can't hear what's there properly."

Page, who has previously gone on record as saying that the well was dry regarding unreleased Zeppelin tracks, revealed that the upcoming reissues will showcase the path not taken for various Zeppelin favorites: "There was an overage of material -- different versions of things, different approaches to the mixes."

He went on to talk about some of the work the band did at Headley Grange, the legendary English manor where the band lived while recording parts of Led Zeppelin III, Led Zeppelin IV, Houses Of The Holy, and Physical Graffiti: "The classic there was 'When the Levee Breaks,' where the drums were set up in the hallway. You know what it sounded like -- immense -- from the recorded version. But we used the drums in the hall for a number of things, like 'Kashmir' -- some with closer miking. So there were a lot of different approaches. It will be fascinating for people to witness the work in progress."

Page wouldn't give a definitive time-line for when fans can count on the remastered and expanded catalogue being released, explaining, "You've got to get to the point where all of the members of the group are in agreement. I would hope it is sooner rather than later. But it will be in the course of next year and going on for awhile. . . This will be really substantial stuff."

Jimmy Page told us that Zeppelin's time recording at Headley Grange brought out the best in every one of them: "As far as Led Zeppelin, it was a really important time to go to this house and live there, and it's a residential recording facility, if you like, with this recording truck outside and as far as I was concerned, I knew that if we got together under those circumstances, we were going to produce some amazing work, and of course we did. It's the fourth album, quite an amount from the Houses Of The Holy album, and of course, Physical Graffiti -- 'Kashmir' was done there, as well."